// 实现这个项目的构建任务
const {src, dest, parallel, series ,watch} = require('gulp')
const del = require('del')
const browserSync = require('browser-sync')

const loadPlugins = require('gulp-load-plugins')
const plugins = loadPlugins()
const bs = browserSync.create()


const data = {
  menus: [
    {
      name: 'Home',
      icon: 'aperture',
      link: 'index.html'
    },
    {
      name: 'Features',
      link: 'features.html'
    },
    {
      name: 'About',
      link: 'about.html'
    },
    {
      name: 'Contact',
      link: '#',
      children: [
        {
          name: 'Twitter',
          link: 'https://twitter.com/w_zce'
        },
        {
          name: 'About',
          link: 'https://weibo.com/zceme'
        },
        {
          name: 'divider'
        },
        {
          name: 'About',
          link: 'https://github.com/zce'
        }
      ]
    }
  ],
  pkg: require('./package.json'),
  date: new Date()
}

const style = () => {
  return src('src/assets/styles/*.scss',{base:'src'})
    .pipe(plugins.sass({outputStyle:'expanded'}))
    .pipe(dest('temp'))
}

const script = () => {
  return src('src/assets/scripts/*.js',{base:'src'})
    .pipe(plugins.babel({presets:['@babel/preset-env']}))
    .pipe(dest('temp'))
}

const page = () => {
  return src('src/*.html',{base:'src'})
    .pipe(plugins.swig({data}))
    .pipe(dest('temp'))
}

const image = () => {
  return src('src/assets/images/**',{base:'src'})
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}

const font = () => {
  return src('src/assets/fonts/**',{base:'src'})
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}

const extra = () =>{
  return src('public/**',{base:'public'})
    .pipe(dest('dist'))
}

const clean = ()=>{
  return del(['dist', 'temp'])
}

const serve = ()=>{
  watch('src/assets/styles/*.scss', style)
  watch('src/assets/scripts/*.js', script)
  watch('src/*.html', page)
  watch([
    'src/assets/images/**',
    'src/assets/fonts/**',
    'public/**'
  ], bs.reload)

  bs.init({
    notify:false,
    port:3001,
    files:'temp/**', //监听文件变化执行bs.reload
    server:{
      baseDir:['temp','src','public'],
      routes:{
        '/node_modules':'node_modules'
      }
    }
  })
}

const useref = () => {
  return src('temp/*.html', { base: 'temp' })
    .pipe(plugins.useref({ searchPath: ['temp', '.'] }))
    // html js css
    .pipe(plugins.if(/\.js$/, plugins.uglify()))
    .pipe(plugins.if(/\.css$/, plugins.cleanCss()))
    .pipe(plugins.if(/\.html$/, plugins.htmlmin({
      collapseWhitespace: true,
      minifyCSS: true,
      minifyJS: true
    })))
    .pipe(dest('dist'))
}

const compile = parallel(style,script,page)

const build = series(clean,parallel(series(compile,useref),extra,image,font))

const dev = series(compile,serve)

module.exports = {
  clean,
  build,
  dev,
}